Internal energy of an ideal gas depends on

Which of the following is true for the gaseous state?

$A$ mixture of one mole each of $H_2$,$He$ and $O_2$ are enclosed in a cylinder of volume $V$ at temperature $T$. If the partial pressure of $H_2$ is $2 \ atm$,the total pressure of the gases in the cylinder is $....... \ atm$

If a gas diffuses $1/5$ times as fast as hydrogen,its molar mass will be....

Write the order of kinetic energy for solid,liquid,and gas.

At constant pressure,the root mean square velocity of an ideal gas is proportional to the density $(d)$ as: